Gardening tool

ABSTRACT

An gardening tool, such as a mower, includes a main body and a handle rotatably connected to the main body. The main body includes a motor. The handle includes a plurality of telescopic members slidably connected to each other. The mower further includes a operation assembly for being operated by a user to activate the motor and a control system for sending a control signal to enable or disable the operation of motor by the operation assembly when the handle is out of a accommodating state.

RELATED APPLICATION INFORMATION

This application claims the benefit of and is a continuation of U.S.application Ser. No. 14/511,490, filed Oct. 10, 2014, which applicationclaims the benefit of CN 201310468919.9, filed on Oct. 10, 2013, and CN201410167041.X, filed on Apr. 23, 2014, the disclosures of which areincorporated herein by reference in their entirety.

FIELD OF THE DISCLOSURE

The present disclosure relates generally to gardening tools, and moreparticularly to mowers.

BACKGROUND OF THE DISCLOSURE

A gardening tool such as a mower performs the tool function mainly in away that a motor of a main body brings functional accessories (e.g., ablade) into operation. Generally speaking, such tools are characterizedby higher power and movement of the functional accessories ischaracterized by high speed and high frequency, which therefore maybring certain hidden danger to an inattentive operator's safety.Currently danger is usually avoided by providing a longer handle to tryand keep the operator far away from the main body. However, in order toconveniently receive the mower, the handle is received in a manner suchas folding or rotating. In this way, it is possible that when the handleis in a received state and the user is too close to the main body, theuser misoperates the switch and thereby starts the mower, whereupon theoperator may place themselves into danger by getting too close to themain body.

The statements in this section merely provide background informationrelated to the present disclosure and may not constitute prior art.

SUMMARY

In one aspect of the disclosure, a gardening tool includes: a main bodyat least having a functional accessory and a motor for driving thefunctional accessory; a handle rotatably connected to the main body andat least having one operation assembly for being operated by a user tocontrol the motor when the handle is in a secure position; and a controlsystem capable of preventing the motor from being controlled by theoperation assembly and halting the motor meanwhile when the handle isout of the secure position.

Particularly, the gardening tool is a mower, wherein the motor is anelectric motor and the functional accessory is a mowing blade.

The gardening tool, particularly a mower according to the presentdisclosure can control the motor and the functional accessorycomprehensively according to the rotation position of the handle and theinstant operation state of the handle. When the handle is in a state ofabnormal use, even if the operation assembly on the handle for normallystarting operation of the tool is misoperated, the motor and thefunctional accessory are not driven, and thereby ensure the user'ssafety and prevent occurrence of danger.

Further areas of applicability will become apparent from the descriptionprovided herein. It should be understood that the description andspecific examples are intended for purposes of illustration only and arenot intended to limit the scope of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of an exemplary gardening tool constructedaccording to the subject disclosure;

FIG. 2 is a partial schematic view of the tool of FIG. 1;

FIG. 3 is an exploded schematic view of a handle and its angle levelmechanism of the tool of FIG. 1;

FIG. 4 is a schematic view of a level changing member of the tool ofFIG. 1;

FIG. 5 is a schematic view illustrating that a telescopic tube does notextend to a designated position in the tool of FIG. 1;

FIG. 6 is a schematic view illustrating that the telescopic tube extendsto a designated position in the tool of FIG. 1;

FIG. 7 is a schematic view illustrating that a handle rotates to adesignated position in the tool of FIG. 1;

FIG. 8 is a schematic view illustrating that a handle does not rotate toa designated position in the tool of FIG. 1;

FIG. 9 is a schematic view of a control device also constructedaccording to the subject disclosure; and

FIG. 10 is a schematic view of the portion shown in FIG. 9 when thehandle rotates to a designated position.

The drawings described herein are for illustrative purposes only ofexemplary embodiments and not all possible implementations, and are notintended to limit the scope of the present disclosure. Correspondingreference numerals indicate corresponding parts throughout the severalviews of the drawings.

DETAILED DESCRIPTION

The following description of the preferred embodiments is merelyexemplary in nature and is in no way intended to limit the invention,its application, or uses.

Referring to Fig. b1 through FIG. 10, as a preferred embodiment, agardening tool according to the present invention is an electric mower100.

The mower 100 comprises a main body 10, a handle 20 and a controlsystem. The handle 20 is rotatably connected to the main body 10. Theuser may achieve accommodation by rotating the handle 20 to adjust anoperation posture or reducing space occupied by the mower 100.

The main body 10 comprises a motor and a functional accessory. Thefunctional accessory is used to perform the function of the tool.Regarding the mower 10, the functional accessory is a mowing blade. Themotor functions to drive the functional accessory to move in a certainmanner to achieve the tool function. Regarding the mower 100, the motordrives the functional accessory to rotate at a high speed. The followingdescription is explained with the motor being an electric motor—which isnot intended to be limiting.

To make the user have a comfortable and reliable operating experience,the handle 20 preferably comprises two handle bars. The ends of thehandle bars close to the main body 10 are respectively connected to arotation shaft 21 to achieve rotatable connection with the main body 10,and the ends away from the main body 10 are provided with an operationassembly therebetween. Regarding the mower 100, the operation assemblycomprises a trigger B. By operating the trigger B, the user may achievecontrol of the mower 100 to start or stop the motor. Certainly, theoperation assembly may also comprise other operating members such as abutton.

The handle 20 at least comprises two telescopic tubes 20 a, 20 b.Specifically, one telescopic tube 20 b forms a sleeve structure, and theother telescopic tube 20 a is inserted into the telescopic tube 20 b toform a slidable connection so that the telescopic tube 20 a can achievetelescoping.

In addition, in a preferred embodiment as shown in FIGS. 2, 3 and 5, inorder to achieve adjustment of angle level when the handle 20 rotates,the angle level mechanism comprises a level changing member 23 and alocking mechanism 24 and is disposed at the rotation shaft 21 forconnecting the handle 20 and the main body 10. The handle 20 is providedwith the locking mechanism 24 which is automatically snap fitted with aplurality of levels of the level changing member 23 so as to fix andadjust the handle 20.

The level changing member 23 is used to set levels and cooperate withthe locking mechanism to lock the levels. As a preferred embodiment, thelevel changing member 23 is a level change locking plate 231 which is inthe shape of a plate structure. Certainly, the level changing member maytake other forms such as a block shape. Besides, a mounting notch 233 isprovided in a lower portion of the level change locking plate 231 sothat the rotation shaft 21 will not be hindered upon rotating to changethe level. Noticeably, the levels are a plurality of limiting holes 235a, 235 b, 235 c or an arcuate limiting notch 234 preferably formed onthe level change locking plate 231, and the limiting holes 235 a, 235 b,235 c are located on the two sides of the limiting notch 234.

To better and flexibly adjust and fix the levels, the locking mechanism24 comprises a level changing assembly for adjusting the levels and acontrol assembly for controlling the level changing assembly.

The level changing assembly comprises an automatic telescopic pin 241, apin sleeve 242 and an elastic member 243, wherein the automatictelescopic pin 241 may cooperate with the limiting holes 235 a, 235 b,235 c and the limiting notch 234 to achieve level locking, the pinsleeve 242 is fixedly connected to an outer pipe 20 b and sleeved aroundthe outer periphery of the automatic telescopic pin 241 so as toconstitute a slidable connection with the automatic telescopic pin 241,and the elastic member 243 may elastically eject the automatictelescopic pin 241 to the level of the level change locking plate 231 toachieve automatic locking of the level in the absence of an externalforce.

As a preferred solution, an end of the pin sleeve 242 fixedly connectedto the outer pipe 20 b is provided with external threads, and the outerpipe 20 b is provided with a through hole 247 at the connection betweenthe pin sleeve 242 and the outer pipe 20 b. The through hole 247 isinternally processed to form internal threads for mating with theexternal threads of the pin sleeve 242, so that the pin sleeve 242 isfixedly connected with the outer pipe 20 b. Certainly, other methods mayalso be employed: for example, the portion of the pin sleeve 242provided with external threads passes through the outer pipe 20 b andthen is fixedly connected with a nut 246 so as to fixedly connect thepin sleeve 242 and the outer pipe 20 b.

To enable the automatic telescopic pin 241 to automatically cooperatewith the levels better, a pin limiting structure is formed on theautomatic telescopic pin 241, a sleeve limiting structure is formed onthe pin sleeve 242, and the elastic member 243 is located between thepin limiting structure and the sleeve limiting structure. Preferably,the elastic member 243 is a spiral spring, the pin limiting structure isan annular step formed on an outer periphery of the automatic telescopicpin 241, and the sleeve limiting structure is an annular step formed inthe pin sleeve 242. As such, one end of the spiral spring abuts againstthe pin limiting structure, and the other end abuts against the sleevelimiting structure so that the automatic telescopic pin 241 tends tomove towards the level of the level changing member to achieve automaticlevel locking.

Upon level change operation, the automatic telescopic pin 241 needs toretreat out of a level and move, whereby the control assembly is neededto bring the automatic telescopic pin 241 to move.

The control assembly comprises an operation member 244 and a fixingmember 245, wherein the operation member 244 is an executing member usedby the operator to achieve level adjustment, and the operation member244 is provided with an anti-skid structure at an end thereof to bemanually held so that that the operator may control the operation member244 more reliably. The automatic telescopic pin 241 passes through thepin sleeve 242 and the outer pipe 20 b and is rotatably connected to theother end of the operation member 244. Preferably, a shaft hole isformed at the connection between the automatic telescopic pin 241 andthe operation member 244, and a shaft is inserted into the shaft hole torotatably connect the automatic telescopic pin 241 and the operationmember 244.

The fixing member 7 is fixedly connected to the outer pipe 20 b providedwith the through hole 247, and the operation member 244 is rotatablyconnected to the fixing member 245. To allow for rotatable connectionbetween the operation member 244 and the fixing member 245, as apreferred solution, a connection shaft hole 240 is formed on both thefixing member 245 and the operation member 244, and upon installation, arotation shaft is inserted into the connection shaft hole 240 to formthe rotatable connection. The resultant rotatable connection is not onlyfirm and reliable, but also simple in structure and easy to install. Assuch, the operation member 244 is formed as a lever with a location forconnection with the fixing member 245 as a pivot point. When an externalforce drives the anti-skid handle of the operation member to approachthe outer pipe 20, the automatic telescopic pin 241, due to the actionof the operation member 244, is forced to move away from the levelchanging member and retract out of the level to get ready for leveladjustment.

To further improve convenience in use, the operation assembly furthercomprises a return member 248 enabling the operation member 244 toreturn automatically in the absence of an external force. Preferably,the return member 248 may be a torsion spring sleeved around the outerperiphery of the rotation shaft. One end of the torsion spring abutsagainst the operation member 244, and the other end thereof abutsagainst the fixing member 7 or the outer pipe 20 b fixedly connected tothe fixing member 245. Therefore, in the absence of the external force,elastic energy of the torsion spring drives the operation member 244 toachieve automatic return. Certainly, the return member 248 here may alsobe designed based on magnetic energy, which is a readily-envisagedvariation and not detailed herein.

The above depictions have introduced a multi-level operation handlemechanism capable of achieving automatic level change conveniently andreliably. A protective cover 249 is mounted outside the outer pipe 20 bmounted with the pin sleeve 242 to protect the multi-level operationhandle mechanism and the mower and provide a more pleasant and compactappearance.

To make the level change locking plate 231 more firmly fixed to a mainbody of the mower, the level change locking plate 231 bends and extendsin a direction parallel to the rotation shaft 21 to form a stoppingstructure 232. The main body of the mower is provided with a mountingstructure for cooperating with the stopping structure 232. The mountingstructure may be, but need not be limited to, a groove integrally formedwith the main body of the mower and configured to accommodate thestopping structure 232. As such, the level change locking plate 231 isfixed on the main body of the mower via screws. Furthermore, thecooperation of the stopping structure 232 and the mounting structure caneffectively prevent displacement and ensure very reliable installationand limiting of the stopping structure 232 and the mounting structure.

As a preferred embodiment, the levels comprise limiting holes 235 a, 235b, 235 c and a limiting notch 234, wherein there are three limitingholes with two of them being adjacent to each other and located on thesame side of the limiting notch 14. A first height level 235 a and asecond height level 235 b are used to adjust the height of the operationhandle upon normal use of the mower to meet the needs of different usergroups with different heights, and the remaining limiting hole 235 c isarranged on the other side of the limiting notch 234 and used as anaccommodating level for folding the handle upon accommodating the mower.The limiting notch 234 is a movable level having an arc-shaped end andallowing the automatic telescopic pin 241 to move upon grass dumpingoperation.

The control system is used to ensure security when the user is using themower 100, and it at least can lock the motor so that the motor is notcontrolled by the operation assembly when the handle 20 does not rotateto a designated position, thus the motor remains in a stop state and notstarted.

The advantage of this configuration is that when the handle 20 does notrotate to the designated position (generally a working position of thehandle 20, the position of the handle 20 in FIG. 1), it can be ensuredthat even though the user misoperates the operation assembly, e.g.,inadvertently pulls the trigger B, the motor is locked and cannot bestarted, thereby preventing accidental movement from causing injury tothe user's body. That is because when the handle 20 does not rotate tothe designated position, the user has not gotten ready for mowing and hemight be in a dangerous position and vulnerable to injury.

In consideration of the above and in order to consider all possiblerisks upon use of the mower to provide security and protection to theuser, the control system comprise at least two control devices, whereinone control device can control the motor only when the remaining controldevices all are in a designated state.

As such, only when the control devices responsible for monitoring riskitems all are in a designated state corresponding to absence of dangercan the control device in the control system initiatively controlled bythe user be unlocked to achieve its function. If one control deviceresponsible for monitoring risk items is in a state corresponding topresence of danger, it locks the control device in the control systeminitiatively controlled by the user so that the user cannot start themotor, and stops the running motor and functional accessory in case thatthe motor is running.

Preferably, the control system comprises a first control devicecontrolled by the user via the operation assembly. The first controldevice can be operated by the user to start the motor only when theremaining control devices in the control system all are in thedesignated state. The first control device is a user end control devicethat can be locked by any other control devices responsible formonitoring risk items in the control system.

The first control device may comprise a first switch or a first signalsource device, or a combination thereof.

Generally, to achieve control of the user end, only one first switch orone first signal source device is needed. However, for the sake ofsecurity, to make sure that the user's operation is indeed intended tostart the mower 100 and ensure safety, the first control devicecomprises a plurality of first switches and a plurality of first signalsource devices, preferably two first switches, wherein one first switchis a contact switch that can be triggered by the trigger B and connectedin series in a power supply circuit of the motor, and the motor is notpowered when it is switched off, and it switches on the circuit when itis triggered by the trigger B. The other first switch is a positionswitch which is also connected in series in the power supply circuit ofthe motor, and it switches on the circuit when it detects that thetrigger B moves to a corresponding position. As such, security guaranteemay be increased by determining double control.

Certainly, one first signal source device may be set. This first signalsource device may be a photoelectric switch which participates incontrol by sending a control signal to the switch in the power supplycircuit. The photoelectric switch may be used to detect the user'soperation action or detect whether there is an obstacle in anadvancement direction of the mower 100.

Preferably, the first switch is one of a contact switch, a proximityswitch, a Hall switch and a photoelectric switch, and the first signalsource device is one of a contact switch, a proximity switch, a Hallswitch and a photoelectric switch.

Referring to FIG. 1, as the simplest solution, the first control deviceonly comprises one first switch which is connected in series in thepower supply circuit. The first switch is a contact switch SW that canbe controlled by the trigger B.

The risk items monitored by the control device may comprise: an angle ofthe handle relative to the main body, telescopic situations of thetelescopic tubes, electric power source temperature, motor temperatureand blocked rotation.

When the angle of the handle relative to the main body is taken as therisk item to be monitored, the control system comprises a second controldevice that can be controlled by the handle according to its rotation.When the handle rotates to a designated position relative to the mainbody, the second control device unlocks the first control device so thatthe first control device can start the motor, and when the handlerotates to a position other than the designated position relative to themain body, the second control device locks the first control device sothat the first control device cannot start the motor.

The second control device comprises a second switch or a second signalsource device, or a combination thereof. The second switch is connectedin the power supply circuit, and the second signal source device cansend a control signal to the power supply circuit.

The second switch is one of a contact switch, a proximity switch, a Hallswitch and a photoelectric switch; and the second signal source deviceis one of a contact switch, a proximity switch, a Hall switch and aphotoelectric switch.

Referring to FIG. 2, FIG. 7 and FIG. 8, as a preferred solution, thesecond control device only comprises a second switch disposed at therotation shaft of the handle. The second switch is a contact switch SW1secured to the main body 10. A contact is provided on one side of thesecond switch towards the rotation shaft 21. A trigger member 22 isprovided at a location in the axial direction of the rotation shaft 21corresponding to the contact switch SW1. When the handle 20 brings therotation shaft 21 to rotate, the trigger member 22 triggers the contactof the contact switch SW1 when it rotates to a designated angle(generally, when the handle 20 rotates to a designated secure position).

As shown in FIG. 9 and FIG. 10, as another preferred solution, thesecond control device only comprises a second switch disposed at therotation shaft of the handle. The second switch is a contact switchSW1′. The contact switch SW1′ is mounted on the handle 20′ and rotatesalong with it. A contact of the contact switch SW1′ faces towards a mainbody 10′. The main body 10′ is provided with a fixed trigger member 22′.A slant surface F is formed on one side of the trigger member 22′opposite to the handle 20′. When the handle 20′ rotates, the contactswitch SW1′ rotates along with it. When the handle 20′ rotates to acertain angle, the slant surface F gradually presses the contact of thecontact switch SW1′ along with the rotation, and when the handle 20′rotates to a designated angle, the slant surface F completely triggersthe contact switch SW1′.

When the telescopic situation of the telescopic tube is taken as therisk item to be monitored, the control system further comprises a thirdcontrol device. The third control device can be controlled by atelescopic action of one telescopic tube 20 a. When the telescopic tubeextends to a designated position relative to the other telescopic tube,the third control device unlocks the first control device so that thefirst control device can start the motor, and when the telescopic tubeextends to a position other than the designated position, the thirdcontrol device locks the first control device so that the first controldevice cannot start the motor.

The third control device comprises a third switch or a third signalsource device, wherein the third switch is connected in the power supplycircuit, and the third signal source device can send a control signal tothe power supply circuit.

Preferably, the third switch is one of a contact switch, a proximityswitch, a Hall switch and a photoelectric switch; and the third signalsource device is one of a contact switch, a proximity switch, a Hallswitch and a photoelectric switch.

As shown in FIG. 5 and FIG. 6, as a preferred solution, the thirdcontrol device only comprises a second switch disposed at an end of thetelescopic tube 20 b. The second switch is a contact switch SW2. Thetelescopic tube 20 b is a sleeve structure. A contact P of the contactswitch SW2 penetrates a pipe wall of the telescopic tube 20 b andextends into the sleeve structure. The telescopic tube 20 a is insertedinto the telescopic tube 20 b, and a trigger member 20 a′ is disposed ata bottom end of the telescopic tube 20 a. When the telescopic tube 20 ais drawn out of the telescopic tube 20 b (i.e., when the handle 20 is inan extended state), the trigger member 20 a′ triggers the contact P ofthe contact switch SW2 via contact.

Preferably, the contact switch SW, the contact switch SW1 and thecontact switch SW2 all are connected in series on the same line of thepower supply circuit. When one of the contact switch SW1 and the contactswitch SW2 switches off, no matter whether the contact switch SW istriggered by the trigger B to be in an off or on state, the power supplycircuit cannot communicate with the line to allow the electric powersource to provide electrical energy to the motor, thereby achievingsafety protection.

As a preferred solution, in order to prevent the functional accessoryfrom moving due to inertia and thereby causing injury to the user afterthe motor turns off, the mower 100 further comprises a brake systemconfigured to brake the mowing blade by physical contact. The brakesystem can brake the functional accessory at least when the controlsystem controls the motor to stop.

Specifically, any one of the control devices controls the motor to turnoff, and then the control system controls the brake system to stop themowing blade from continuing to move due to the inertia, therebyachieving urgent braking. Such braking may be achieved by contacting themowing blade or by contacting a transmission member fixedly connectedthereto.

In the brake system, electrical control of entity devices may beachieved by attraction and release of an electromagnet.

The above illustrates and describes basic principles, main features andadvantages of the present invention. Those skilled in the art shouldappreciate that the above embodiments do not limit the present inventionin any form. Technical solutions obtained by equivalent substitution orequivalent variations all fall within the scope of the presentinvention.

What is claimed is:
 1. A gardening tool, comprising: a main body havingat least a functional accessory and a motor for driving the functionalaccessory; a handle, rotatably connected to the main body, having atleast one operation assembly for being operated by a user to control themotor when the handle is in a secure position; a locking mechanism forlocking the rotating position of the handle; a locking member configuredto engage with the locking mechanism and providing at least a lockingstructure to cause the locking mechanism to keep the handle at anaccommodating position relative to the main body when the gardening toolis not being used; and a control system capable of preventing the motorfrom being controlled by the operation assembly and halting the motorwhen the handle is out of the secure position, the control systemcomprising: a first control device configured to be controlled by theoperation assembly; and a second control device configured to becontrolled according to the rotating position of the handle wherein,when the handle rotates to a designated position relative to the mainbody, the second control device unlocks the first control device so thatthe first control device allows starting of the motor, and, when thehandle rotates to the accommodating position relative to the main body,the second control device locks the first device so that the firstcontrol device is not allowed to start the motor; and wherein the secondcontrol device comprises at least one of a switch connected to the powersupply circuit and a signal source device for sending a control signalto control the motor.
 2. The gardening tool as recited in claim 1,further comprising an electric power source and a power supply circuitfor enabling the electric power source to provide power to the motorwherein the control system comprises a switch connected to the powersupply circuit to connect the electric power source to the motor ordisconnect the electric power source to the motor.
 3. The gardening toolas recited in claim 2, wherein the switch is mounted to the handle androtates with the handle synchronously.
 4. The gardening tool as recitedin claim 2, wherein the switch is mounted to the main body and thehandle rotates relatively to the switch.
 5. The gardening tool asrecited in claim 1, further comprising an electric power source and apower supply circuit for enabling the electric power source to providepower to the motor wherein the control system comprises a signal sourcefor sending a control signal to the power supply circuit to disconnectthe electric power source to the motor.
 6. The gardening tool as recitedin claim 5, wherein the signal source is mounted to the handle androtates with the handle synchronously.
 7. The gardening tool as recitedin claim 5, wherein the signal source is mounted to the main body andthe handle rotates relatively to the signal source.
 8. The gardeningtool as recited in claim 1, wherein the handle comprises a plurality oftelescopic members for connecting the operation assembly to the mainbody, and wherein, when a one of the plurality of telescopic membersextends to the designated position relative to another of the pluralityof telescopic members, a third control device unlocks the first controldevice so that the first control device is capable of starting themotor, and, when the one of the plurality of telescopic members is in aposition other than the designated position, the third control devicelocks the first control device so that the first control device is notcapable of starting the motor.
 9. The gardening tool as recited in claim8, further comprising an electric power source and a power supplycircuit for enabling the electric power source to provide power to themotor wherein the control system comprises a switch and a signal source,the switch is configured to be triggered by the operation assembly toactivate the motor, and the signal source sends a signal to the powersupply circuit to disable the activation of the motor when the one ofthe plurality of telescopic members is caused to be move away from thepredetermined position relative to the another of the plurality oftelescopic members.
 10. The gardening tool as recited in claim 8,further comprising an electric power source and a power supply circuitfor enabling the electric power source to provide power to the motorwherein the control system comprises a plurality of signal sources forsending a signal to the power supply circuit to control the connectionbetween the electric power source and the motor, the plurality of signalsources enable the operation of the operation assembly to the motor whenthe one of the plurality of telescopic members is caused to move to apredetermined position relative to another of the plurality oftelescopic members and the one of the plurality of signal sourcesdisable the operation of the operation assembly to the motor when theone of the plurality of telescopic members is caused to be move awayfrom the predetermined position relative to the another of the pluralityof telescopic members.
 11. A mower, comprising: a main body having atleast a functional accessory and a motor for driving the functionalaccessory; a handle, rotatably connected to the main body, having atleast one operation assembly for being operated by a user to control themotor when the handle is in a secure position; a locking mechanism forlocking the rotating position of the handle; a locking member configuredto engage with the locking mechanism and providing at least a lockingstructure to cause the locking mechanism to keep the handle at anaccommodating position relative to the main body when the mower is notbeing used; and a control system capable of preventing the motor frombeing controlled by the operation assembly and halting the motor whenthe handle is out of the secure position, the control system comprising:a first control device configured to be controlled by the operationassembly, and a second control device configured to be controlledaccording to the rotating position of the handle wherein, when thehandle rotates to a designated position relative to the main body, thesecond control device unlocks the first control device so that the firstcontrol device allows starting of the motor, and, when the handlerotates to the accommodating position relative to the main body, thesecond control device locks the first device so that the first controldevice is not allowed to start the motor, and wherein the second controldevice comprises at least one of a switch connected to the power supplycircuit and a signal source device for sending a control signal tocontrol the motor.
 12. The mower as recited in claim 11, furthercomprising an electric power source and a power supply circuit forenabling the electric power source to provide power to the motor whereinthe control system comprises a switch connected in the power supplycircuit to connect the electric power source to the motor or disconnectthe electric power source to the motor.
 13. The mower as recited inclaim 12, wherein the switch is mounted to the handle and rotates withthe handle synchronously.
 14. The mower as recited in claim 12, whereinthe switch is mounted to main body and the handle rotates relatively tothe switch.
 15. The mower as recited in claim 11, further comprising anelectric power source and a power supply circuit for enabling theelectric power source to provide power to the motor wherein the controlsystem comprises a signal source for sending a control signal to thepower supply circuit to disconnect the electric power source to themotor.
 16. The mower as recited in claim 15, wherein the signal sourceis mounted to the handle and rotates with the handle synchronously. 17.The mower as recited in claim 15, wherein the signal source is mountedto main body and the handle rotates relatively to the signal source. 18.The mower as recited in claim 11, wherein the handle comprises aplurality of telescopic members for connecting the operation assembly tothe main body, and wherein, when a one of the plurality of telescopicmembers extends to the designated position relative to another of theplurality of telescopic members, a third control device unlocks thefirst control device so that the first control device is capable ofstarting the motor, and, when the one of the plurality of telescopicmembers is in a position other than the designated position, the thirdcontrol device locks the first control device so that the first controldevice is not capable of starting the motor.
 19. The mower as recited inclaim 18, further comprising an electric power source and a power supplycircuit for enabling the electric power source to provide power to themotor wherein the control system comprises a switch and a signal source,the switch is configured to be triggered by the operation assembly toactivate the motor, and the signal source sends a signal to the powersupply circuit to disable the activation of the motor when the one ofthe plurality of telescopic members is caused to be move away from thepredetermined position relative to the another of the plurality oftelescopic members.
 20. The mower as recited in claim 18, furthercomprising an electric power source and a power supply circuit forenabling the electric power source to provide power to the motor whereinthe control system comprises a plurality of signal sources for sendingsignal to the power supply circuit to control the connection between theelectric power source and the motor, the plurality of signal sources arecapable of enabling the operation of the operation assembly to the motorwhen the one of the plurality of telescopic members is caused to move toa predetermined position relative another of the plurality of telescopicmembers and the one of the plurality of signal sources is capable ofdisabling the operation of the operation assembly to the motor when theone of the plurality of telescopic members is caused to be move awayfrom the predetermined position relative to the another of the pluralityof telescopic members.